The holidays are here, with their intricate blessings and woes. There are presents to buy, visits to plan, cards to send and meals to prepare, at least for those who are so inclined. Those who are not ...

Turning the clocks forward an hour in the spring for daylight saving time is followed by a spike in heart attacks on the Monday afterward, said a US study on Saturday. But when the clocks fall back ...

As modern lifestyles increasingly challenge the body's natural circadian rhythm, the American Heart Association is spotlighting the potential health consequences of regular disruptions to our body's ...

WASHINGTON — It’s a sound that jolts most people awake—even from some of the deepest sleep. We hit the snooze button, but the persistent, sometimes annoying, sound of our alarm clocks just won’t quit.

Heart attacks that strike in the middle of the night appear to inflict less damage on the heart than those that hit during ...

Your heart's beat isn't its only pulse, scientists have discovered. The heart's genes -- and the liver's, too -- have rhythms of their own. Every animal has built-in biological clocks that keep the ...